And that's really its major advantage over off-site resorts: It's proximity and transportation options. While off-site resorts may or may not have such options, the Disney resorts have a significant advantage, surely in terms of proximity, but also in terms of access: In many cases, Disney transportation provides better access to their own parks than off-site shuttles are allowed to provide.
Other than that, it is debateable whether the theming at Pop Century is a plus or minus, as compared to the alternatives.